Effect of tertiary amine accelerators with different substituents on curing kinetics and reactivity of epoxy/dicyandiamide system

Non-isothermal Differential Scanning Calorimetry and gel time measurements were employed to study the effects of four different tertiary amine accelerators with different molecular structure and substituents on the curing behavior and reactivity of epoxy/dicyandiamide (DICY) system. Results showed t...

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Bibliographic Details
Published in:Polymer testing 2017-05, Vol.59, p.344-354
Main Authors: Hesabi, Mohammadnabi, Salimi, Ali, Beheshty, Mohammad Hosain
Format: Article
Language:English
Subjects:
Accelerator
Accelerators
Atomic properties
Atomic structure
Computer simulation
Curekinetics
Curing
Dicyandiamide
Differential scanning calorimetry
Electron density
Epoxy
Epoxy resins
Heat measurement
Molecular structure
Nitrogen atoms
Reaction kinetics
Reactivity
Storage life
Studies
Time measurement
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Summary:Non-isothermal Differential Scanning Calorimetry and gel time measurements were employed to study the effects of four different tertiary amine accelerators with different molecular structure and substituents on the curing behavior and reactivity of epoxy/dicyandiamide (DICY) system. Results showed that the acceleration behavior depends on three factors: the bulkiness, the number of nitrogen atoms in molecular structure and the electron density of accelerator. Among these, the former two factors demonstrated stronger effect. The results of model fitting kinetic demonstrated that Šesták–Berggren model can well simulate the reaction rates especially for the samples accelerated by 2,4,6-tris(dimethylaminomethyl)-phenol and (Dimethylaminomethyl)phenol. The activation energy projected by Flynn-Wall-Ozawa and Kissinger–Akahira–Sunose methods exposed different amounts for each accelerator while both models revealed similar trends. Moreover, 1-methylimidazol-accelerated samples showed shortest storage life and gel time mainly due to the presence of two nitrogen atoms in a compact structure of accelerator.
ISSN:0142-9418
1873-2348
DOI:10.1016/j.polymertesting.2017.02.023